Lady of Conquest (Brides of Legend Book 2)

They call him Conn of the Hundred Battles, the warrior-king who forged a nation from a land of isolated clans. As High King of Ireland, he rides with the legendary Fianna, his elite band of warriors. But a threat to the throne looms from a mysterious enemy who has vanquished several of Conn's bravest warriors. Conn rides out alone to face a seemingly invincible foe, never dreaming he will find a grief-maddened hellcat with emerald eyes and hair like liquid flame...

Wielding a sword called Vengeance, Gelina Ó Monaghan has sworn to defeat the man she holds responsible for her family's ruin. She never dreams she will be captured by him--and lose her heart in the bargain. Their forbidden passion will spark a private war fought with swords and kisses, promises and betrayal...until they discover the sweetest surrender of all in each other's arms.

Book 2 in Teresa's beloved "Brides of Legend" Series, which includes:
Shadows and Lace
Lady of Conquest